generates a string randomly from given characters, extended file functionality

string_gen.php

<?php

# Colour functions
function blue($text) {
    return "\e[;36m$text\e[0m";
}

function blue_bold($text) {
    return "\e[1;36m$text\e[0m";
}

function red($text) {
    return "\e[;31m$text\e[0m";
}

function yellow($text) {
    return "\e[0;33m$text\e[0m";
}

function yellow_bold($text) {
    return "\e[1;33m$text\e[0m";
}

function output($input, $alpha, $length) {
    $output = '';
    for ($i = 1; $i <= $length; $i++) {
        $output .= $alpha[array_rand($alpha)];
    }
    return $output;
}

# Define options
$input = getopt('hmnpcis:f::l:d::', ['help', 'match', 'newline', 'progress', 'interactive', 'speed:', 'calc', 'file::', 'alpha:', 'add:', 'length:', 'delete::']);

# If no flags exist
if (empty($input)) {
    echo "Use ".yellow("-h")." or ".yellow("--help")." to access the help menu.\n";
    exit;
}

# Help text
if (array_key_exists('help', $input) || array_key_exists('h', $input)) {
    echo "\n                ".blue_bold("HELP MENU")."\nSHORT       LONG                DESCRIPTION\n-h        --help        Display this text.\n-p        --progress    Output the string one character at a time\n-s        --speed       Set the speed of individual output (higher numbers are slower)\n\n            ".blue("STRING GENERATION")."\n-l        --length      Set length of string to generate.\nN/A       --alpha       Set alphabet to use (a-z by default.)\nN/A       --add         Add characters to default alphabet (a-z by default.)\n-m        --match       Enable duplicate characters.\n-c        --calc        Calculate the probability of the alphabet occuring in sequence. (WIP)\n\n                ".blue("FILE OUTPUT")."\n-f        --file        Set name of output file (will create if non-existent.)\n-n        --newline     Write output on new line in output file.\n-d        --delete      Delete contents of output file (enter 'y' to delete after writing)\n\n";
}

# If interactive
if (array_key_exists('interactive', $input) || array_key_exists('i', $input)) {
    # Set output length
    $length = 0;
    echo "Enter length:\n";
    $length = readline('> ');
    while ($length <= 2) {
        echo "Please enter a number higher than 2.\n";
        $length = readline('> ');
    }
} else {
    # Set output length
    # If length has been chosen and isn't empty
    if (array_key_exists('length', $input) && !empty($input['length'])) {
        $length = $input['length'];
    # If l has been chosen and isn't empty
    } elseif (array_key_exists('l', $input) && !empty($input['l'])){
        $length = $input['l'];
    # If empty and help flags don't exist
    } elseif (!empty($input) && !(array_key_exists('help', $input) || array_key_exists('h', $input))) {
        echo "Please enter a length.\n";
        $length = 0;
        exit;
    # If help flags exist
    } elseif (array_key_exists('help', $input) || array_key_exists('h', $input)) {
        exit;
    }

    # Open file
    # If file has been chosen
    if (array_key_exists('file', $input)) {
        $filename = $input['file'];
        $file_open = true;
        if (empty($input['file'])) {
            echo "Please enter a filename.\n";
        } else {
            echo "Writing to:\n".blue($filename)."\n";
        }
    # If f has been chosen
    } elseif (array_key_exists('f', $input)){
        $filename = $input['f'];
        $file_open = true;
        if (empty($input['f'])) {
            echo "Please enter a filename.\n";
        } else {
            echo "Writing to:\n".blue($filename)."\n";
        }
    } else {
        $file_open = false;
    }

    # Add alphabet
    $dupes_found = false;
    if (array_key_exists('alpha', $input) && !empty($input['alpha'])) {
        $alpha = [];
        $chars = str_split($input['alpha']);
        foreach ($chars as $to_add) {
            if (array_key_exists('match', $input) || array_key_exists('m', $input)) {
                $alpha[] = $to_add;
            } elseif (!in_array($to_add, $alpha)) {
                $alpha[] = $to_add;
            } else {
                $dupes_found = true;
            }
        }
    } elseif (array_key_exists('add', $input) && !empty($input['add'])) {
        $alpha = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
        $chars = str_split($input['add']);
        foreach ($chars as $to_add) {
            if (array_key_exists('match', $input) || array_key_exists('m', $input)) {
                $alpha[] = $to_add;
            } elseif (!in_array($to_add, $alpha)) {
                $alpha[] = $to_add;
            } else {
                $dupes_found = true;
            }
        }
    } else {
        $alpha = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
        //$alpha = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '!', ',', '.', '-', '+', '=', '-', '_', '?', '#', '~', ':', ';'];
    }
    if ($dupes_found) {
        echo "Duplicate letters found and skipped (enable matches to prevent.)\n\n";
    }
    $alpha_string = implode('', $alpha);
    echo "Chosen alphabet:\n'".blue($alpha_string)."'\n\n";

    # Generate string
    if (array_key_exists('p', $input) || array_key_exists('progress', $input)) {
        # echo letter by letter
        if (array_key_exists('s', $input))  {
            $speed = $input['s'];
        } elseif (array_key_exists('speed', $input)) {
            $speed = $input['speed'];
        } else {
            $speed = 66;
        }
        $output = '';
        for ($i = 1; $i <= $length; $i++) {
            $current = $alpha[array_rand($alpha)];
            $output .= $current;
            echo yellow($current);
            usleep($speed);
        }
        echo "\n";
    } elseif (array_key_exists('calc', $input) || array_key_exists('c', $input)) {
        # Calculate probability
        $output = output($input, $alpha, 100*count($alpha));
        $count = substr_count($output, $alpha_string);
        $divided = 100*count($alpha) / $count;
        echo "$count\n$divided\n";
        echo $output;

    } else {
        # echo full string
        $output = output($input, $alpha, $length);
        echo "$output\n";
    }

    # Write to file
    if ($file_open) {
        $erase_after = false;
        if (array_key_exists('delete', $input)) {
            if (empty($input['delete'])) {
                $erase_after = false;
            } else {
                $erase_after = true;
            }
            $file = fopen($filename, 'w');
        } elseif (array_key_exists('d', $input)) {
            if (empty($input['d'])) {
                $erase_after = false;
            } else {
                $erase_after = true;
            }
            $file = fopen($filename, 'w');
        } elseif (array_key_exists('newline', $input) || array_key_exists('n', $input)) {
            $file = fopen($filename, 'a');
            fwrite($file, "\n");
        } else {
            $file = fopen($filename, 'a');
        }
        fwrite($file, $output);
        if ($erase_after) {
            $file = fopen($filename, 'w');
        }
    }
}


?>